• 박물관보존과학
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• 제11권
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• pp.9-16
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• 2010

국립춘천박물관은 고려 철제석가여래좌상의 부식방지와 상설전시 활용을 위하여 보존처리를 실시하였다. 처리 전 유물의 상태는 부식으로 인한 표면 박락현상이 관찰되었고 가부좌의 오른편 둔부에서 다리부분까지 결손되어 정상적인 전시가 불가능 하였다. 따라서 표면의 이물질을 제거하고 강화·보호 위한 강화처리 작업이 진행되었다. 강화처리 진행에 앞서 국내·외 연구 자료를 바탕으로 micro crystalline wax계를 선정하여 기초 실험을 실시하였다. 그 결과 (주)동남유화의 wax(in xylene) 5wt%가 백화현상과 표면 색상변화가 적으며 작업에 편리성이 높아 강화제로 선택하여 부식을 억제하였다. 결손부분의 복원은 내부 지지대 제작과 함께 epoxy계 수지를 이용하여 탈착이 가능한 복원을 실시하여 전시 효용성을 높였다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.389-390
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• 2012

In this study, we fabricate a superhydrophobic surface made of hierarchical nanostructures that combine wax crystalline structure with moth-eye structure using vacuum cluster system and measure their hydrophobicity and durability. Since the lotus effect was found, much work has been done on studying self-cleaning surface for decades. The surface of lotus leaf consists of multi-level layers of micro scale papillose epidermal cells and epicuticular wax crystalloids [1]. This hierarchical structure has superhydrophobic property because the sufficiently rough surface allows air pockets to form easily below the liquid, the so-called Cassie state, so that the relatively small area of water/solid interface makes the energetic cost associated with corresponding water/air interfaces smaller than the energy gained [2]. Various nanostructures have been reported for fabricating the self-cleaning surface but in general, they have the problem of low durability. More than two nanostructures on a surface can be integrated together to increase hydrophobicity and durability of the surface as in the lotus leaf [3,5]. As one of the bio-inspired nanostructures, we introduce a hierarchical nanostructure fabricated with a high vacuum cluster system. A hierarchical nanostructure is a combination of moth-eye structure with an average pitch of 300 nm and height of 700 nm, and the wax crystalline structure with an average width and height of 200 nm. The moth-eye structure is fabricated with deep reactive ion etching (DRIE) process. $SiO_2$ layer is initially deposited on a glass substrate using PECVD in the cluster system. Then, Au seed layer is deposited for a few second using DC sputtering process to provide stochastic mask for etching the underlying $SiO_2$ layer with ICP-RIE so that moth-eye structure can be fabricated. Additionally, n-hexatriacontane paraffin wax ($C_{36}H_{74}$) is deposited on the moth-eye structure in a thermal evaporator and self-recrystallized at $40^{\circ}C$ for 4h [4]. All of steps are conducted utilizing vacuum cluster system to minimize the contamination. The water contact angles are measured by tensiometer. The morphology of the surface is characterized using SEM and AFM and the reflectance is measured by spectrophotometer.